Study On Driver Injury In Oblique Crash Under Car To Car Collision

In recent years, with the rapid economic growth, the vehicle becomes an important transportation tool for more and more normal families. The car ownership increases year by year in China. The increase of car ownership facilitates people’s lives, but brings a series of social problems such as traffic safety, air pollution and energy problems. The traffic accident has become a serious public security issue. One of the high frequency traffic accidents is car-to-car crash. For different car crashes, frontal impact happened most frequently and caused the greatest number of casualties. Nowadays, vehicle safety design is mainly based on100%overlap frontal rigid wall impact and40%overlap offset impact, there is less research on the oblique crash especially car-to-car oblique crash.To make up the above shortcomings, the driver injury and the protective effect from airbag in car to car30degree oblique crash were mainly discussed. The main content of this dissertation are shown as following:1. The full car finite element models of Toyota Yaris, Ford Taurus and Ford Explorer were used to conduct car-to-car crash simulation, including100%overlap frontal impact,40%overlap offset impact,25%overlap offset impact and30degree oblique crash. The driving area and occupant restraint system models of these three cars were developed to simulate driver injury. The simulation results were used to indicate the driver’s injury characteristics in30degree oblique car-to-car crash.2. The driver injury responses of40%overlap offset crash and30degree oblique crash were compared by conducting the simulations with different airbag inflation time. The comprehensive injury index WIC were calculated to get the best airbag inflation time in30degree oblique crash. Thus, the airbag protection features were found out.3. Latin Hypercube Sampling were used to optimize the constraint system parameters of Yaris target car, which results in poorest driver injury, and the best constraint system parameters were obtained.It is indicated that in30degree oblique crash, lower limbs injury can be easily caused, the companion cars’drivers would get more serious chest injury when companion cars get bigger, and driver’s neck shear force would increase in target cars. The target cars’drivers would get better protection from airbag in30degree oblique crash than in40%overlap offset crash when target cars get bigger, which is contrast for companion cars. The best airbag inflation time for companion car is earlier in30degree oblique crash than in40%overlap offset crash. The comprehensive injury index WIC in Yaris target car is reduced by30.5%after the optimization of constraint system. This can provide references for the matching of seat belts and airbags.